diff --git a/ci/doc_requirements.txt b/ci/doc_requirements.txt
index e6379babc1b..4fc45927dac 100644
--- a/ci/doc_requirements.txt
+++ b/ci/doc_requirements.txt
@@ -1,4 +1,4 @@
-sphinx==3.2.1
+sphinx==3.3.0
 sphinx-gallery==0.8.1
 myst-parser==0.12.10
 netCDF4==1.5.4